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A person walks along an east-west street...

A person walks along an east-west street and a graph of his displacement from home is shown in figure. His average velocity for the whole time interval is:-

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The average velocity is zero, since the displacement vector is zero. The instantaneous velocities are just the slopes of the curve at each point. At A the velocity is `40 =(6.7)/(6)` m/min east. At B, it is zero. At C it is `-(65)/(5)=-13` m/min east, or + 13 m/min west.
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